Lifting-jack.



E. c. BATES.

L|FT|NG JACK.

APPLICATION FILED SEPT.'16| I9l4.

1,239,818, K Patented June 19, 1917'.`

EDIVINID C, BATES, OF ALLIANCE, OHIO, ASSIGNOR T THE BUCKEYE JACKMANUFAC- TURING COMPANY, ALLIANCE, OHIO, A CORPORATION OF OHIO.

Application filed September 16, 1914.

To all whom t may concern:

Be it known that I, EDMUND C. Barns, a citizen of the United States,residing at Alliance, in the county of Stark and State of Ohio, haveinvented certain new and useful Improvements in Lifting-Jacks, of whichthe following is a specification.

The invention relates to jacks having ratchet teeth on the side of thelifting bar, and a pair of pawls operating in alternate engagementtherewith for lifting and lowering the bar; and the object of theimprovement is to provide simplified and efficient means for controllingthe action and operation of the reversing lever employed in ]acks ofthis type.

rThe object of the invention is attained by providing a torsion springhaving one of its ends extended to form an yelongated finger in slidingengagement with one end of the reversing lever, for holding the sameeither in or out of its proper position for reversing the operation ofthe jack, and at the same time permitting the lever to yield in theperformance of its reversing action.

A preferred embodiment of the invention is illustrated in theaccompanying drawings, forming part hereof, in which Figure 1 is aperspective view of the lift ing jack, with one side plate omitted toshow details of the operating elements;

Fig. 2, a fragmentary side elevation of the same; and

Fig. 3, a fragmentary perspective vie iv of a modified form of thecontrolling spring.

Similar numerals refer to similar parts throughout the drawings.

The base 1 of the jack is provided with the upright standard 2, in whichis formed a guideway for the lifting bar 3 having the rest 4 on itsupper end and the ratchet teeth 5 on one side.

The operating lever 6 is fulcrumed on the pivot T mounted in thestandard, on which ivot is also mounted one of the pawls 8, while'theother pawl 9 is mounted on the inner end 6a of the lever by means of thepivot 10; the pawls S and 9 being adapted to alternately engage theratchet teeth on the side of the lifting bar for the purpose of raisingor lowering the same in the manner well known in the art.

The reversing lever 11 is mounted on the pivot 12 on the side of thestandard, adj acent to and preferably below the pivot 7 of Specificationof Letters Patent.

Patented June 19, 1917.

Serial No. 862,005.

the operating lever; and the reversing-lever is provided with theoperating handle 13 extending outward, and the lowering block 1liextending inward and upward from its pivotal bearing. The lowering blockisprovided with the cam faces 15 and 16 coperating respectively with theposts 17 and 1S on the sides of the pawls 8 and 9, for controlling thesame in the action of lowering the lifting bar in a manner well known inthe art.

The coil of the spring 19 is mounted on the post 2O fixed on one side ofthe stand ard 2 adjacent to and above the lowering block 14:; whichspring has one end Qlusecured to or stopped by the flange 2a on thestandard, and its other end 22 is elongated and extend d downward as afinger in sliding engagement with the inner end 23 of the reversinglever, in which end is provided the notch 24 for holding the springfinger from lateral displacement on the end of the lever.

By this construction and arrangement, it is evident that the lateralpressure of the elongated finge-r 22 against the inner end 23 of thereversing lever serves to hold the same upward, with the cam faces onthe loweringblock in the path of the posts on the sides of the pawls,for controlling the same in the reversing or lowering operation of thejack, as shown in Fig. 1; or to hold the inner end of the reversinglever downward with the cam faces of the lowering block out vof the pathof the pawl posts, when rotated to such position by means of the handle13 on the outer end of the lever, as shown in Fig. 2; which rotation ispermitted by the sliding of the inner end of the reversing lever alongthe finger of the torsion spring.

And it is also evident that when the lowering block` on the inner end ofthe reversing lever is held upward to bring its cam faces in the path ofthe pawl posts, the sliding contact of the finger of the controllingspring permits the intermittent movement of the block required for aproper control of the pawls in their action in lowering the lifting bar.

The spring finger may be shaped with the reverse bends 25 and 2G in itsshank, below which the engaging portion may be formed substantiallystraight, as shown in Figs. 1 and 2, or the entire finger can be shapedas a fiat curve 2Q, as shown in Fig. 3, without materially varying itssliding action in IOC' holding and controlling the operation of thereversing lever.

I claim:

A lifting jack including an upright standard With a lifting baroperatively mounted therein having ratchet teeth on on'efs'ide, anoperating lever fulcrumed on the Standard, a paWl pivoted to thestandard and a paWl pvoted to the vinnerfend of the operating leveroperatively engaging the ratchet teeth, there being posts on the sidesof the pawls, afreversing'lever pivoted to the standard havia-ig alowering block on its inner end with cam faces which may be rotated intothe path of the ypawl posts, and spring mounted on the standard havingan'elongated laterally yield'ingspring abutment in sliding engagementwith one end of the reversing lever for pressing the same in opposite.directions for holding` the .lowering block either in or out of thepath of the pawl posts.

p EDMUND C. BATES. Witnesses: Lann C. CARLSON. LoU-Isn M. Comix.

-Ccpies of this patent lmay .be obtained .for five cents each, byaddressing the Commissioner o ftlatents,

` 'Washington, D. C.

